THE BIRDS OF NORTHERN THAILAND 469 



Those observed by me were near the ground, moving rapidly through 

 a dense tangle of vines and other vegetation growing on the steep slope 

 of a ravine at the edge of moist evergreen forest. 



The type has the front and crown chestnut-rufous, with a band of 

 black beginning above each eye and extending to the nape ; the rest of 

 the nape ashy white ; the dorsum ashy gray, suffused with olive-green 

 posteriorly and on the scapulars; the rump yellow; the upper tail 

 coverts olive-green; the wings blackish, the exposed parts of the 

 feathers edged with olive-green, the median and greater upper coverts 

 also broadly tipped with yellow to form two bars ; the rectrices black- 

 ish, their exposed parts edged with olive-green, the two outermost 

 pairs wholly white on the inner webs; an eye ring of tiny ashy-white 

 feathers; the lores, sides of the head and neck, the chin, throat, and 

 entire breast ashy gray; the center of the abdomen white; the re- 

 maining underparts yellow. 



SEICERCUS ALBOGULARIS HUGONIS (Deignan) 



Thai Black-throated Flycatcher Warbler 



Abroscopits albogularis hugonis Deignan, Auk, 1938, p. 510 (Pang Mae Ton, Doi 



Langka, northern Thailand). 

 Abroscopus albogularis albogularis, Riley, Journ. Siam Soc. Nat. Hist. Suppl., 



1933, p. 158 (Doi Langka) ; U. S. Nat. Mus. Bull. 172, 1938, p. 439 (Doi 



Langka, Doi Hua Mot). 

 Abroscopus albogularis hugonis, Greenwat, Bull. Mus. Comp. Zool., 1940, p. 190 



(Doi Nang Kaeo). 



Like other diminutive flycatcher warblers of the mountain ever- 

 green, this species is seldom seen and appears to be very rare. The 

 only specimens known from our area are a male from Doi Langka, 

 May 2, 1931, and a female from Doi Hua Mot, August 14, 1934, both 

 collected by Smith; a mummified example from Doi Ang Ka, April 

 1931, sent by me to the Princeton Museum of Zoology; a female taken 

 by Griswold on Doi Nang Kaeo, 2,800 feet, April 9, 1937. On Doi 

 Suthep I saw one or two at 4,500 feet, October 10, 1936. 



The few observed by me were in dense forest and, on Doi Ang Ka, 

 accompanied a flock of Alcippe castaneceps exul. 



Griswold's bird of April 9 is listed by Greenway (loc. cit) as a nest- 

 ling ; Smith's example of August 14 is in postnuptial molt. 



The adult has the forehead, crown, and nape light rufous-brown, the 

 crown and nape bordered at each side by a black streak; the remain- 

 ing upperparts dark olive-green, with a broad yellowish-white band 

 across the rump ; the sides of the head and neck (including the super- 

 ciliary region) light rufous; the feathers of the chin white, those of 

 the throat, black with white tips ; the breast, upper flanks, and under 

 tail coverts yellow ; the remaining underparts white. 



